body {
    font-family: Inter, system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
    margin: 0;
    background: #f9fafb;
    color: #1f2937;
    line-height: 1.6;
}

header {
    background: #111827;
    color: #fff;
    padding: 16px 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    box-shadow: 0 2px 6px rgba(0,0,0,0.2);
}

.logo {
    display: flex;
    align-items: center;
    font-size: 28px;
    font-weight: bold;
    color: #fff;
    gap: 10px;
    cursor: pointer;
    text-decoration: none;
    color: inherit;
}

.logo-img {
    height: 55px;
    width: auto;
}

header h1 {
    font-size: 20px;
    margin: 0;
    font-weight: 600;
}

nav {
    display: flex;
    gap: 16px;
}

nav a {
    color: #e5e7eb;
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s;
}

nav a:hover {
    color: #38bdf8;
}

.container {
    display: grid;
    grid-template-columns: 240px 1fr;
    gap: 32px;
    max-width: 1200px;
    margin: 32px auto;
    padding: 0 16px;
}

aside {
    background: #fff;
    border: 1px solid #e5e7eb;
    border-radius: 12px;
    padding: 20px;
    position: sticky;
    top: 24px;
    height: fit-content;
}

aside h2 {
    font-size: 16px;
    margin-top: 0;
    margin-bottom: 12px;
    font-weight: 600;
    color: #374151;
}

aside ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

aside li {
    margin-bottom: 8px;
}

aside a {
    text-decoration: none;
    color: #374151;
    font-size: 14px;
    transition: color 0.2s;
}

aside a:hover {
    color: #0ea5e9;
}

main {
    background: #fff;
    border: 1px solid #e5e7eb;
    border-radius: 12px;
    padding: 28px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.04);
}

main h1, main h2, main h3 {
    color: #111827;
}

main pre {
    background: #f3f4f6;
    padding: 12px;
    border-radius: 8px;
    overflow-x: auto;
}

footer {
    text-align: center;
    padding: 24px;
    color: #6b7280;
    font-size: 14px;
    margin-top: 40px;
    border-top: 1px solid #e5e7eb;
}

@media(max-width: 900px) {
    .container {
        grid-template-columns: 1fr;
    }
    aside {
        position: relative;
        top: auto;
    }
}